I love using my iPad as a drawing tablet, particularly for weaving designs. The large shapes and fluid gestures adapt well to interpretation in weave structures. Here's one I did the other day with the Procreate app.
And here it is woven as a lampas fabric with that strange polyurethane yarn I spoke of the other day. Sandra has identified it as a yarn purchased a while ago from Textura.
I think it's going to work great as a book cover, after I coat the back with acrylic medium.